Commutator



W. SPARKS.

. COMMUTATOR.

APPLICATION FILED JULY 16. 1920-,

1,421,734. I PatentedJu1y4,1922.

[IVE/V703 ATTOEJES v OFFICE.

WILLIAM SPARKS, OF JACKSON, MICHIGAN, ASSIGNOR TO SPARKS-WITHINGTONCOMPANY, OF CLEVELAND, OHIO,.A CORPORATION OF OHIO.

comMU'rA'roR.

To all whom it may concern:

Be it known that .I, WILLIAM SPARKS, of Jackson, in the county ofJackson, in the State of Michigan, have invented new and usefulImprovements in Commutators, of which the following, taken in connectionwith the accompanying drawings, is a full, clear, and exact description.

his invention relates to certain improvements in commutators.

The primary object of the invention is to produce an eflicientcommutator of relatively simple and inexpensive construction. Otherobjects and advantages relate to the details of construction as'willappear from the following description taken in connection with theaccompanying drawings, in which Figure tator.

Figure of Fig. 1.

Figure 3 is a cross-section similar to Figure 2 of a slightly modifiedform of device.

Figure 4. is a view of the ordinary hollow 1 is an elevation of thecommu- 2 is a cross-section on line 22,

rivet capable of usein the manufacture of the commutator.

As shown, the commutator comprises a disk -1.of insulatin materialhaving formed therein a plurality of, in this instance, seven openings,or conduits 2 each adapted for the reception of the tubular shank 3 of ahollow rivet 4, the headportion 5 ofwhich may be cut to sector shape, asshown in Figure 1. When the hollow shank 3 has been passed through itsrespective conduit 2-, the projecting end ma be spread or riveted intocontact with t e adjacent face of the insulating disk -1 to rigidly holdthe parts in desired position. The head of each rivet when so assembledwith the insulating disk, is adapted'to constitute a contact, and whenthe heads are shaped preferably in the manner shown, each contact isspaced from the adjacent contacts a distance desired, dependent upon theform and size of the rivet head, the diameter of the insulating. diskand the extent to which the rivet heads are cut down, if at all. Theterminal wires, as

Specification of Letters Patent.

Application filed Jul 16,

Patented July 4, 1922. 1920. Serial No. 396,801

-;6, may perhaps preferably, as shown in Figure 2, be secured within theinterior of the hollow shank 3 in any suitable manner, or as shown inFigure 3, the wire -6- may be soldered or otherwise secured to the heads--5- constituting the face contacts of the commutator.

The disk l is shown as mounted upon a shaft 3- in the usual manner, andthat shaft may or may not be the armature shaft of a motor.

' Although I have shown and described a specific construction of devicewith definitely formed parts assembled and secured together in aparticular manner, I do not desire to limit myself to the details ofform, arrangement or construction, as many changes may be made in eachwithout departing from this invention as set forth in the appendedclaims.

What I claim is: 1. A commutator comprising a disk having an openingtherethrough and a contact member having a tubular shank extendedthrough said opening and secured to the disk and a head portion insubstantial contact with one face of the disk.

2. A commutator comprising an insulating disk having an openingtherethrough, and a. contact member having a web portion in substantialvcontact with one face. of the disk and a tubular shank centrally engagedwith said head and extended through the opening in the disk, and securedto the disk. v

3. A commutator comprising an insulating disk having a plurality ofopenings therethrough, and a plurality of contact members each memberhaving a tubular shank extended through a respective opening and securedto th'e'disk, and a head portion connected with each member, such headportion in substantial contact with oneface of the disk.

In witness whereof I have hereunto set my hand this 30 day of June,1920.

WILLIAM SPARKS.

Witnesses:

RoLLIN R. BLIss, Rosoon BROWN.

